The Mercedes F1 W05 Hybrid, originally known as the Mercedes F1 W05, was a highly successful F1car designed and developed under the direction of Bob Bell, Aldo Costa, Geoff Willis, Loic Serra, Russell Cooley, John Owen, Mike Elliott and Jarrod Murphy to compete in the 2014 F1 season. The cars were driven by 2008 world champion Lewis Hamilton and Nico Rosberg, both of whom remained with the team for a second and fifth season, respectively. The F1 W05 was designed to use Mercedes's new 1.6-litre V6 turbocharged engine, the PU106A Hybrid.

The chassis was named "F1 W05 Hybrid" to represent the fifth F1 car that Mercedes had constructed since 2010, while the hybrid was marked to recognize the utilization of fully integrated hybrid power units. The car made its competitive debut at the 2014 Australian GP, the opening round of the 2014 season. After participating in 18 rounds of Grand Prix racing, the car made its final competition appearance at the season finale race – the 2014 Abu Dhabi GP, before retirement. As the first Mercedes F1 car of the hybrid era of the sport, this was the car that kick-started an unparalleled period of dominance by Mercedes in the sport that lasted for eight years, delivering 81 Grand Prix wins for Hamilton, 20 for Rosberg (until 2016) and 10 (from 2017) for Valtteri Bottas. It became the second Mercedes F1 car to win the drivers' title in 59 years and the first to win the constructors' title.

The car was an instant success, with Nico Rosberg winning the season-opening Australian GP by 27 seconds. Lewis Hamilton went on to win the Malaysian GP, Bahrain GP, Chinese GP and Spanish GP successively. The car was said to be so dominant because of an innovative design feature on the PU106A, the car's engine. Sky Sports F1 reported that the compressor and turbo were packaged at opposite ends of the internal combustion engine, which gave them the edge in packaging, aerodynamic efficiency, and battery usage. Lewis Hamilton described it as the best car he has ever driven.

At the halfway point of the season, Mercedes had secured all but one win – in Canada, won by the Red Bull driver, Daniel Ricciardo – and one pole, when Williams driver Felipe Massa did so in Austria. This came after Hamilton won the British GP and Rosberg won the Monaco, Austrian and German Grands Prix. The team clinched the Constructors' Championship at the Russian GP, the 16th race of the season. In the nineteen races, the F1 W05 Hybrid took sixteen wins (eleven for Hamilton and five for Rosberg), eighteen pole positions (seven for Hamilton and eleven for Rosberg), twelve fastest laps (seven for Hamilton and five for Rosberg), twelve front row lockouts and eleven 1–2 finishes.

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